If the springs are ok, then you might only need a little lube on the governor. I am not sure if you can get the parts but you might try contacting them here:

http://www.centuryelectricmotor.com/Contact-Us.aspx

Parts: http://www.centuryelectricmotor.com/...t.aspx?id=8644

A.O.Smith motors was bought out by Regal Beloit and they are now selling under the Century brand.